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I need to find out whether a new storage server is an adequate replacement for an existing one (TrueNAS Core)

I have a bunch of benchmarks using FIO for the new system with varying blocksize, with resulting IOPS and Bandwidth numbers.

However, I could not discover a way to correlate these numbers to our existing system. I can see that our blocksize is 4 MB and I see the IOPS using zpool iostat (on the pool).

Is it just a matter of comparing the IO and Bandwidth from zpool iostat with FIO numbers at the 4 MB block size?